riffle$70729$ - définition. Qu'est-ce que riffle$70729$
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Qu'est-ce (qui) est riffle$70729$ - définition

HYDROLOGICAL FLOW STRUCTURE
Riffle-Pool Sequence; Pool-riffle sequences; Pool-and-riffle
  • Two pools separated by a riffle in Giba river in Ethiopia
  • Dogu'a Tembien]], Ethiopia

Riffle-pool sequence         
In a flowing stream, a riffle-pool sequence (also known as a pool-riffle sequence) develops as a stream's hydrological flow structure alternates from areas of relatively shallow to deeper water. This sequence is present only in streams carrying gravel or coarser sediments.
Elmidae         
  • ''Hydora picea'' illustration by [[Des Helmore]]
FAMILY OF BEETLES
Riffle beetle; Riffle beetles
Elmidae, commonly known as riffle beetles, is a family of beetles in the superfamily Byrrhoidea described by John Curtis in 1830. Both adults and larvae are usually aquatic, living under rocks in fast-flowing shallow areas of streams, such as riffles, feeding on algae and biofilms.
Riffle (anonymity network)         
ANONYMITY NETWORK
Riffle (Anonymity network)
Riffle is an anonymity network developed by researchers at MIT and EPFL as a response to the problems of the Tor network.

Wikipédia

Riffle-pool sequence

In a flowing stream, a riffle-pool sequence (also known as a pool-riffle sequence) develops as a stream's hydrological flow structure alternates from areas of relatively shallow to deeper water. This sequence is present only in streams carrying gravel or coarser sediments. Riffles are formed in shallow areas by coarser materials, such as gravel deposits, over which water flows. Pools are deeper, calmer areas whose bed load (in general) is made up of finer material such as silt. Streams with only sand or silt laden beds do not develop the feature. The sequence within a stream bed commonly occurs at intervals of from 5 to 7 stream widths. Meandering streams with relatively coarse bed load tend to develop a riffle-pool sequence with pools in the outsides of the bends and riffles in the crossovers between one meander to the next on the opposite margin of the stream. The pools are areas of active erosion and the material eroded tends to be deposited in the riffle areas between them.